JONATHAN KARL and GREGORY SIMMONS
ABC News 
Sept 14, 2010
In Tuesday’s Delaware primary, the tea party movement may inflict its most devastating wound yet to the Republican establishment.
With an assist from Sarah Palin, tea party activists in Delaware are trying to defeat the Republican candidate with the best chance to win Joe Biden’s old Senate seat and nominate instead a candidate Republican leaders say has no chance of winning the general election in November.
Rep. Mike Castle is considered a slam dunk to capture Joe Biden’s old Senate seat. Castle is a pro-abortion rights, pro-gun control Republican who often works with Democrats. Those traits have helped make him the most popular Republican in a state that leans heavily Democratic; Castle has twice been elected governor and was elected as Delaware’s sole representative in the House nine times.